4.3j = 51.6 how do u solve this by equation style

Ineed someone to me answer my question i have to have this done and knocked out

If two lines form congruent alternate interior angles with a transversal, then the lines

The maximum distance (in nautical miles) that a radio transmitter signal can be sent is represented by the expression 1.23h√, where h is the height (in feet) above the transmitter. estimate the maximum distance x (in nautical miles) between the plane that is receiving the signal and the transmitter. round your answer to the nearest tenth.